Document complete footprint of signer

[jpraynaud]

Issue

Measure and document the complete footprint of a signer:

• signer alone and signer + cardano node
• preview/preprod
• mainnet (if possible)

Minimum information needed:

• CPU usage (min/max/avg/std)
• Memory usage (min/max/avg/std)
• Network usage (min/max/avg/std)
• Disk usage (binary + data + logs)

[jpraynaud]

Closed with #1907